There has been a lot of bad media speculation about a black hole in space. By looking more closely it becomes more apparent which a black hoke really is.

Gravitational collapse requires great density. In the current epoch of the universe these high densities are found only in stars, but in the early universe shortly after the Big Bang densities were much greater, possibly allowing for the creation of black holes. High density alone is not enough to allow black hole formation since a uniform mass distribution will not allow the mass to bunch up. In order for primordial black holes to have formed in such a dense medium, there must have been initial density perturbations that could then grow under their own gravity.

A neutron star that is 4 suns in weight or more has a special property. An object orbiting will reach the speed of light .The orbital angular momentum is unable to resist the intense force of gravity. The result is that an orbiting object heats up substantially before it ultimately recombs and crashes into the neutron star. With enough mass the radius of boundary layer extends above the surface constituting an event horizon. This leads to the idea that a black hole has mass, electric charge and angular momentum.

R = 2GM / c2

Where R is the radius, G is the gravitational constant and M is the mass. These black holes are often referred to as Schwarzschild black holes after Karl Schwarzschild who discovered this solution in 1916. The weak and the strong cosmic censorship hypotheses are two mathematical conjectures about the structure of gravitational singularities arising in general relativity.

Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace. The first modern solution of general relativity that would characterize a black hole was found by Karl Schwarzschild in 1916, and its interpretation as a region of space from which nothing can escape was first published by David Finkelstein in 1958.

Black holes were long considered a mathematical curiosity; it was not until the 1960s that theoretical work showed they were a generic prediction of general relativity. The discovery of neutron stars by Jocelyn Bell Burnell in 1967 sparked interest in gravitationally collapsed compact objects as a possible astrophysical reality. The first black hole known as such was Cygnus X-1, identified by several researchers independently in 1971.

Expected collision between Andromeda and the Milky Way in 4 billion years

Andromeda is moving towards the Milky Way and in maybe 4-8 billion years from now they most likely merge. Some stars will likely be slung far way while others will be gobbled by the black hole cores. The merging will also cause more starts to be born in the gas clouds. Before this happens the sun will have burned out to a white dwarf.

Its apparent that galaxies are all lorded with black holes with a giant at the core. The core grows with the intense gravity and it quickly can reach more than 100,000 suns in mass. Some galaxies seem to have even larger core black holes. The gravitation pull of a black hole can afford enough energy to retain stars as far away as 100,000 light years in orbit.

When two galaxies merge the black holes tend to merge leading to a new single galaxy that is highly disrupted. Most likely the galactic cores gained mass over time 13 billion years, This type of merging is likely the source of the most extreme gamma ray bursts seen in the universe,

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